package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的日期
        List<LocalDate> dateList = new ArrayList<>();
        //存放第一天
        dateList.add(begin);
        //用于存放到end那一天
        while (!begin.equals(end)){
            //用于计算日期的后一天
            begin = begin.plusDays(1);
            dateList.add(begin);
        }


        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            //如果营业额为空就赋值为0.0
            turnover = turnover == null ? 0.0 : turnover;
            //存放营业额
            turnoverList.add(turnover);
        }

        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的日期
        List<LocalDate> dateList = new ArrayList<>();
        //存放第一天
        dateList.add(begin);
        //用于存放到end那一天
        while (!begin.equals(end)){
            //用于计算日期的后一天
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //存放每天用户总数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("end",endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的日期
        List<LocalDate> dateList = new ArrayList<>();
        //存放第一天
        dateList.add(begin);
        //用于存放到end那一天
        while (!begin.equals(end)){
            //用于计算日期的后一天
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放数据
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        //遍历dateList集合
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            //查询每天订单总数
            Integer orderCount = orderMapper.countByMap(map);
            orderCountList.add(orderCount);
            map.put("status",Orders.COMPLETED);
            //查询每天有效订单总数
            Integer validOrderCount = orderMapper.countByMap(map);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内有效的总数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount !=0 ){
            orderCompletionRate=validOrderCount.doubleValue() / totalOrderCount;
        }

        OrderReportVO build = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
        return build;
    }

    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        //封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库，获取营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //填充数据---30天内的
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);
            //营业额
            sheet.getRow(3).getCell(2).setCellValue(businessData.getTurnover());
            //订单完成率
            sheet.getRow(3).getCell(4).setCellValue(businessData.getOrderCompletionRate());
            //新增用户数量
            sheet.getRow(3).getCell(6).setCellValue(businessData.getNewUsers());
            //有效订单
            sheet.getRow(4).getCell(2).setCellValue(businessData.getValidOrderCount());
            //平均客单价
            sheet.getRow(4).getCell(4).setCellValue(businessData.getUnitPrice());

            //填充数据---每天的明细数据
            for (int i=0 ; i<30 ; i++){
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO businessData1 = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                XSSFRow row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData1.getTurnover());
                row.getCell(3).setCellValue(businessData1.getValidOrderCount());
                row.getCell(4).setCellValue(businessData1.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData1.getUnitPrice());
                row.getCell(6).setCellValue(businessData1.getNewUsers());
            }

            //通过输出流下载Excel文件到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private Integer getOrderCount(LocalTime begin, LocalTime end, Integer status){
        Map map = new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",Orders.COMPLETED);
        return orderMapper.countByMap(map);
    }
}
